The toaster my mom got in 1951 was probably a T-20B it's Patins were 1942-44-47-50. I know because I have one. When I sold a house for an deceased gentleman, his son held a sale of items on tables in the basement. There, I swear to God, was a T20B in perfect condition(brand new).
You know the rest; I bought it for the asking price, $2. Have used it every day since 2002 and it's beautiful to look at and shines-up like 1950's chrome on the cars.